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Original Article
Lymph node ratio and preoperative CA 19-9 levels predict overall survival and recurrence-free survival in patients with resected pancreatic adenocarcinoma 
Sabrina C Wentz, Zhi-Guo Zhao, Yu Shyr, Chan-Juan Shi, Nipun B Merchant, Kay Washington, Fen Xia, A Bapsi Chakravarthy 
World J Gastrointest Oncol 4(10):207-215. Published online Oct 15, 2012. doi: 10.4251/wjgo.v4.i10.207